Fluid pressure sensing and feeding device



June 141', 1960 e. D. HALL. 2,940,469

FLUID PRESSURE SENSING AND FEEDING DEVICE Filed Oct. 1?, 1958 a Sheets-Sheet 1 INVENTOR.

GUY D. H4LL 47" TOE V5 VS i FLUID PRESSURE SENSING AND FEEDING DEVICE Guy D. Hall, Box 732, Perryton, Tex.

Filed Oct. 17, 1958, Ser. No. 767,832

Claims. (Cl. 137-425) The present invention relates to a device for feeding air or other fluid under pressure to an implement orfngachine and sensing the pressure of the fluid as it is e Implements and machines actuated by air or other fluid pressure frequently require a skillful operator for the reason that the fluid pressure applied to the implement or machine must be fed gradually and in increments of increased and decreased pressures sequentially tlrilrough a cycle of operation of the implement or mac me. the fluid pressure at each step of the operation and to increase or decrease the pressure according to the machine demand.

An object of the present invention is to provide a fluid pressure sensing and feeding device which enables a machine or implement operator to constantly sense the pressure of fluid being fed to a machine or implement.

- Another object of the present invention is to provide a compact control valve or device for attachment in the fluid pressure supply conduit of a machine or implement operable by fluid pressure which lends itself to eflicient control of the fluid pressure admitted to such machine or implement, one which is readily portable, one sturdy in construction and fabricated of few parts requiring little or no attention, and one which is economically feasible. These and other objects and advantages of the pres ent invention will be fully apparent from the following description when taken in conjunction with the annexed drawings, in which:

. Figure 1 is an isometric view of the device of the present invention; 7 Figure 2 is a view taken on the line 2-2 of Figure 1 and on an enlarged scale, with the valve in closed position; Figure 3 is a view similar to Figure 2 with the valve in open position;

Figure 4 is a view taken on the line 4-4 of Figure 2;

Figure 5 is a view taken on the line 5--5 of Figure 3; and Figure 6 is a view taken on the line 6-6 of Figure 2.

Referring to the drawings, and in particular to Figures 2 and 3, the fluid pressure sensing and feeding device of the present invention comprises an upstanding closed ended casing 10 having a closed upper end 12 and an enlarged lower end portion 14 constituting a pressure sensing chamber, as indicated by the numeral 16. An inlet 13 is in the Wall of the casing 10 inwardly of and adjacent the upper closed end 12 and is adapted to 'be connected by means of a conduit 20 to a source of fluid or air under pressure. An outlet 22 is in the wall of the casing 10 between the inlet 18 and the pressure sensing chamber 16 and is adapted to be connected by means ofxa conduit 24 to an implement or machine to be actuated by air or fluid under pressure.

The operator is required to expertly estimate nited States Patent C Patented June 14,

ice

An upstanding plunger 26 is mounted in the casing 10 for upward and downward movement. The plunger 26 has a portion 28 adjacent the upper end position above the inlet 18, and between the'inlet 18 and the closed upper end 12 of the casing 10. The portion of the plunger 26 adjacent the lower end thereof is within the pressure sensing chamber 16 and carries thereon a piston 30.

The plunger 26 is divided with a valve chamber 32 intermediate the ends thereof and a valve 34 having a stem 36 is positioned in the chamber 32 and normally, as in Figure 2, is seated upon the valve seat 38. i

A portion of the plunger 26 immediately below'the upper end portion 28 is of reduced diameter forming an inlet chamber between it and the inner wall of the casing 10. The chamber is designated bythe reference numeral 40. Radially extending bores extend inwardly from the chamber 40 to a counterbore which extends upwardly from the upper end of the valve chamber 32, such bores and counterbores constituting -a first inlet pas sage 42. One end of the inlet passage 42 is connected in communication with the inlet 18 and the other end is connected in communication with the valve chamber 32.

The plunger 26 is also provided with a second passage 44 having the upper end connected in communication with the valve chamber 32 and having the lower end connected in communication, by means of reduced passageways 46 and the piston 30, with the pressure sensing chamber 16. L

The second passage 44 is also connected in communication With the outlet 22 by means of an outlet chamber 48 provided between the exterior of a reduced portion of the plunger 26 and the adjacent portion of the inner wall of the casing 10, such reduced portion of the plunger 26 being intermediate the valve seat 38 and the lower end portion 14 of the casing 10. Bores 50 extend inwardly of the exterior of the reduced portion'of the plunger 26 below the valve seat 38 and are in com munication with the passage 44.

The stem 36 of the valve 34 extends through the passage 44 and slida-bly through the piston 30 and has the portion adjacent the lower end within the pressure sensing chamber 16. A machine screw 52 is threaded in a threaded bore provided in a closure member 54 which is threaded on the lower end portion of the casing '10 and forms a means by which the chamber 16 is closed. The machine screw 52 constitutes a. shelf means engagea'ble with the lower end of the valve stem 36 for support of the valve stem 36.

A coil spring 56 is circumposed about the portion of the valve stem 36 between the underface of the piston 30 and a cup washer 58 which is held on the lower end of the valve stem 36 by means of a split ring assembly 60 of conventional construction.

A hand actuable means, including an upstanding actuator pin 62, is slidably supported in the upper closed end 12 of the casing 10 and has its lower end engageable with the upper end of the plunger 26. The hand actuable'means includes a lever 64 exterior of the cas: ing 10 and rockably supported upon the upper end of the casing 10 and engaging the upper end of thepin 62. One end of the lever 64 carries a hand grip ball 66 and the other end is reduced in thickness and extends between a bifurcated bracket 68 carrying a pivot pin 70. The pin 76 extends through the adjacent: end of the lever 64 and the forms a means by which the lever 64 is pivotally connected to the casing 10. h

aboutportions of the plunger 26 on each side-of the reduced portions and are seated in appropriately arranged-grooves for sealing the plunger 26 for sliding upward and downward substantially air-tight relation with respect tothe innerwall of the casing 10.

ifflnioperatiom with'the inlet conduit20 connectedto a "source ofair or other fluidunder pressure and the outlet oonduitl24 connected to an implement or machine tov be actuated by such air or fluid, upon manually applied pressure to the lever 64 or hand gripball66, pressure is transmitted through the pin 62 to the plunger 26 e to effect'its downward movement within the casing 10. The

lower end of the valve stem 36 normally rests upon the upper: endof the machine screw'52 and uponmovement of the plunger 26 downwardly,,the spring 56 is compressed and the valve stem '36 moved upwardly relative togthe plunger 26. This disengages' the valve 34 from the valve seat 38 and permits "the passage of air from the inlet 18 through the passage 42 into the valve-'cha'm-j 7 her 32, and thence under the valve 34 into the passage 44- andout of the outlet 22. A portion of the air also travels-"through the passageways 46 into the portion'of" the pressure sensing chamber 16 below the piston 30. It will beseen thereforethat as pressure in the implement or machine served by the outlet conduit 24 increases, the. fluid or air pressure willbuild up under the piston 30, forcing the latter upwardlyyand carrying the plunger 26 upwardly to exert pressure through the pin 62' upon the-midportion of the lever 64, which pressure will be 1;.A.fiuid pressure :sensing and feeding device come prising; an upstanding closed; ended casing having a pres-v suresensing chamber in the lower end portion, an inlet in said casing adjacent the closed upper end, an'outlet in a a said casing between said inlet and said pressure sensing chamber,- an upstanding plunger mounted in said casing for upward and downward-movement. and: having. the upper endbetween saidinlet andsaid closedupper end and having the portion adjacent. the lower end in said pressure sensing chamber, a valve chamber in said plunger, said plunger being providedwith a first passage connectingsaid inlet in communication with said valve chamberand also a second passage connecting said: valvecliamber in communication with said pressure sensing chamber and said outlet, a valve seat in said plunger surrounding the end of said second passage adjacent said valve chamber, a valve in said chamber, biasing means ing-uponsaidivalve seat and'closingsaid'second passage,

hand actuable means carried bysaid casing and engageable with the upper end of saidplunger for effecting the downward movement of the latter, said plunger upon execution of the downward movement shifting said valve to open position, and spring means operatively connected to the lower end' portion of said plunger for effecting the upward movement of the latter.

3. A fluid pressure sensing and feeding device comprising an upstanding closed ended casing having a pressure sensing chamber in the lower end portion, an inlet in said casing adjacent the closed upper end, an outlet in said casing between saidinlet and said pressure sensing chamber, an'upst anding plunger mounted in said casing for upward and. downwardmovement and having the upper end between said inlet and said closed upper end and having the portion adjacent-the lower end in said pressure sensing chamber, a piston slidably mounted in said pressure sensing chamber and carried by thelower end of said plunger for movement therewith, a valve chamber in said plunger, .saidplunger being provided with a first passage connecting said inlet in communication with said valve chamber andalso a second passage connecting said valve chamber in communication with said outlet and said pressure sensing chamber through said piston, a valve seat-in said plunger surrounding the end of said second passage adjacent said valve chamber, a valve in said chamber, biasing means urging said valve seat into engagement with said valve to closesaid second passage, a stem extending through said second passage and slidably through said piston andhaving the lower end within said pressure sensing chamber and having the upper end fixedly secured to-said valve, a fixed shelf means in said pressure sensing chamber,the-lower end ofsaid stern being supported on said shelf means,.and hand .actuable meanscarried by s-aid casing and engageable with the upper end out said plunger for effecting-the downward movement of the latter, saidplunger; upon execution of the downward movement shifting said-valve to open position. I

' 4. A. fluid pressure sensing-and fee-dingdevice comprising anjupstanding closed ended casing having a: presurging said valve into engagement with said valve to close said second passage, and hand actuable means carried i by said casingand engageablewith the upper end of said plunger for effecting the downward movement of the latterfsaid' plunger upon executionof the downward movement'shifting said valve to open position.

for upward and downward movement and having the.

upperfend between said inlet andsaid closed upper end havingfthe portion adjacent the: lower end in said pressure sensing chamber; a valve chamber in said plunger, said plunger being provided with a first passage connecting said inlet in communication with said valve chamber and'al'so a. second. passage connecting said valve chamber in, communication with; said pressure sensing chamber-and said outlet, a valve seat in said-plunger sur-f roundingthelend. of said second passage adjacentsaid valve chamber, a. valve in said chamber normally seat sure sensing chamber in the lower end portion, aninlct in said-casing adjacent the closed, upper end, an, voutlet in said casing between said inlet and saidpressuresensing'chamber, an upstanding plunger mounted injlsaid casing for upward anddownward' movement and having the upper end between said inlet and said closed upper endand chamber, a-piston slidably mounted in, said pressure sensing chamber and carried by the lower end of said plnnger -for movement -therewith,;a valve chamber in said plunger, said plunger being provided with a first passage connecting said inlet in communication withsaid valve chamber and also, a second passage connecting said valve chamber in communication with said outlet and said'pressure sensing chamber-throughsaid piston, a valve seat in said plunger surrounding the end of said second passage adjacent said valve chamber, a. valve in said chamber and normally seating upon said valve seat enclosing said second passage, a stem extending through said second passage and slidablyithrough said piston and having the lower end said pressure sensing chambe'r andhaving the upper end fixedly secured to said valve, a'fixed shelf meansin said pressure sensing chambenflthe lower end of'said stem. being supported on said shelf means, hand actuable means carried by said casing and engageable with the upper end of said plunger for effectingthe downwardvmovement of the-latter, said plunger upon execution of the downward movement shit'ting said valve to open position, and a coil spring circumposed about the portion of said stem between and operatively connected tosaid piston and shelf means for effectingthe upward movement of'said pistonf 5'. A fluid pres'suresensing and feeding'devicecom:

prising'an'upstanding closed ended casing: having a-pressure sensing chamber in the lower end portion, an inlet in said casing adjacent the closed upper end, an outlet in said casing between said inlet and said pressure sensing chamber, an upstanding plunger mounted in said casing for upward and downward movement and having the upper end between said inlet and said closed upper end and having the portion adjacent the lower end in said pressure sensing chamber, a piston slidably mounted in said pressure sensing chamber and carried by the lower end of said plunger for movement therewith, a valve chamber in said plunger, said plunger being provided with a first passage connecting said inlet in communication with said valve chamber and also a second passage connecting said valve chamber in communication with said outlet and said pressure sensing chamber through said piston, a valve seat insaid plunger surrounding the end of said second passage adjacent said valve chamber, a valve in said chamber, biasing means urging said valve seat into engagement with said valve to close said second passage, a stem extending through said second passage and slidably through said piston and having the lower end within said pressure sensing chamber and having the upper end fixedly secured to said valve, a fixed shelf means in said pressure sensing chamber, the lower end of said stem being supported on said shelf means, and hand actuable means including an upstanding actuator pin slidably supported in the upper closed end of said casing and having the lower end engageable with the upper end of said plunger and a lever exteriorly of and rockably supported on said casing engaging the upper end of said pin for efiecting the downward movement of the latter, said plunger upon execution of the downward movement shifting said valve to open position.

References Cited in the file of this patent UNITED STATES PATENTS Berkoben Sept. 27, 1955 

